You can also browse the code for the Python voting app, Java worker and Node.js results app. You’ll see that it defines five services, using either images straight from the Docker Hub or build directories containing Dockerfiles. Navigate to the directory where the app lives (you’ll find it in your home directory under example-voting-app) and open docker-compose.yml. Now that the app is running, it’s worth having a look at the code. You should see your vote reflected by a 100% turnout. Next, return to Kitematic, click on voteapps_result-app_1, and open it in the browser just as you did with the voting app. You’ll be able to vote for either cats or dogs. Kitematic will show its logs, as well as a web preview.Ĭlick the arrow button above the web preview to open the voting app in a browser. You should see the five containers running in the left-hand column.Ĭlick on voteapps_voting-app_1. To see the containers running, open Kitematic.
Docker Compose will pull all the images it needs from the Docker Hub, build the images for the voting app, results app and worker, create all five containers and finally stream their output to the terminal. Next, enter the directory where the app’s source code lives: Run the following command and press Enter to download the source code for the demo app: When it’s finished, you will see an ASCII-art whale and a command prompt. It will create and start a VirtualBox VM running Docker Engine, then configure the command-line environment so that you can talk to it. It will place two shortcuts on your desktop: Kitematic and Docker Quickstart Terminal. The Toolbox installer will install VirtualBox, Docker Engine, Docker Machine, Docker Compose and Kitematic. To get started, first download and install Docker Toolbox. Here are the steps to reproduce the demo: I then used Kitematic to examine the running app, and showed how I can quickly make changes to it. In the demo I created and ran the containers using Docker Compose, which installs as part of Docker Toolbox, and is now available for the first time on Windows. A Node.js webapp which shows the results of the voting in real time.…A Postgres database backed by a Docker volume.
This was to show how easy it is for new developers to get started when you run your development environments with Docker. Today at DockerCon EU 2015, I ran through a demo of running and developing an app from a fresh computer using Docker Toolbox and Compose.
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